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Selected Problems of Diagnosis of Insulation Systems for Rotating Electrical Machines
Pavlík, Josef ; Radek,, Szabó (referee) ; Singule, Vladislav (referee) ; Hammer, Miloš (advisor)
This dissertation thesis deals with the measurement of insulation resistance for rotating electrical machines and polarization indices calculated from them. The first part contains a short theoretical introduction, methods of measurement and basic formulas for calculations. The second part discusses the results obtained in laboratory measurements in both the model and the real coil of high voltage machine. There are also elucidated some of the principles and causes of some phenomena with which the measurement of insulation resistance is encountered. The third part deals with the results of measurements on real machines. There are mainly discussed the dependences of insulation resistance and polarization index on the influences that occur in measurements such as temperature measured insulation, moisture in the insulation, but also the influence of measuring instruments on the measured values. It is also expressed how much these factors affect the measurement results. In addition, this part deals with some other influences that have a negative affect on the measurement of insulation resistance. There is processed a new methodology for measuring insulation resistence in the fourth part of this thesis. The need to develop a metodology of measuring is based on the needs of engineering practice, where is considerable inconsistency of measurement in the present time. Measurement, and often performed on the same machine, are not nowadays often comparable, because measurements are not met even the basic rules resulting from the findings of research and development, which were discovered in the last few decades. Measurement of insulation resistance in our nowdays methodology stagnated on the level of the seventies of 20th century. For this reason, we have developed a new methodology of measurement that takes into account all significant influences affecting the measurement. The purpose of the methodology is to ensure full repeatability and comparability of measurements not only on the same machine but on machines of the same type, in optimal cases, the machines of different types. There are the chapters "The objectives of the work" and "Conclusion" the part of the work. A very important chapter is "The contribution of thesis", which summarizes the original results of this work and results, the use of which is expected in engineering practice.
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Insulating Properties of Flip Chip Structures
Dóczy, Robert ; Šandera, Josef (referee) ; Pulec, Jiří (advisor)
This work deals with the insulation properties of microelectronic structures. Specifically, insulation resistance of the gap that separates the conductive parts of the system. There are also described the influences, which have the effect on insulation resistance and the methods by which the insulation resistance is measured. There are also slightly described the issues of designing microelectronic packages and ways in which the microelectronic chip can be connected to the circuit. In the experimental part, the thesis deals with specific design of microelectronic structure such as flip-chip. Conductive pattern of this structure was made to allow the measurement of insulation resistance which depends on the application materials which were used in structure assembly. For this purpose, the structures also undergo a series of cleaning, whose influence is also discussed.
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Faults identification of AC windings in production process
Samek, Josef ; Kurfűrst, Jiří (referee) ; Ondrůšek, Čestmír (advisor)
In this paper stator manufacturing process of stator is described. Mainly description is aimed on winding, insulation and copper wire. Discussion about origin of insulation damage possibilities during manufacturing is included. Statistics survey about failure causes of stator revealed during manufacturing process and warranty claims is presented. One test method from list of market available winding tests is chosen - partial discharge; described in detail and applied on the correct stator and the damaged stator. Results are interpreted.
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Temperature and humidity influence on insulation resistance of electric motors
Fiala, Petr ; Vetiška, Vojtěch (referee) ; Ondrůšek, Čestmír (advisor)
The bachelor‘s thesis studies the effects of temperature and relative humidity on the insulation resistance of electric motors and their polarization index. The first chapter describes measuring principle of insulation resistance, measured objects, used measuring instruments and actual environmental conditions. The second chapter defines the basic requirements of insulation systems and there is especially solved evaluation of the measurement of individual parts of motors and calculation of polarization index. Third chapter discusses the influence of temperature and relative humidity on insulation resistance, there are formulated general preconditions and after using climate chamber there are presented measurement results on real motors in the industrial practice.
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Measurement of HV equipments by electronic bridge.
Kumičák, Ivan ; Pelikán, Luděk (referee) ; Krbal, Michal (advisor)
The main idea of this thesis is measurements of dielectric materials by using a device Tettex. The thesis is about basic physic properties of dielectric materials. The determination of a dielectric material is considered. The behavior of these materials in electrical fields and reasons, those can have an influence on it, are considered as well. In the text are described measuring methods of chosen parameters of dielectric materials by device Tettex and its functional principles. There are an evaluation of measurements, which were done, and a discussion about achieved results.
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Cable harness tester
Valenta, Jakub ; Valach, Soběslav (referee) ; Burian, František (advisor)
This semestral paper deals with the issues of testing and requirements examinations for cables and cable harnesses. These terms are defined in the work and the difference in their meaning is described. The work also describes the characteristic features of cables and cable harnesses, explains their importance and focuses in more detail on the variable properties that may change over time or that are dependent on manufacturing errors. The principles and procedures of tests of these properties are covered in the work and are the essence of the subsequent practical part. In this part, the work deals with the design of the measuring circuit prototype for testing of the insulation resistance of cables and their desired continuity in bundles. This design is then physically implemented, the processes of designing and implementing are described in detail and finally its functionality is tested and presented to the reader.
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Dielectric Absorption of Electroinsulating Materials
Pavlinský, Branislav ; Krbal, Michal (referee) ; Pelikán, Luděk (advisor)
This bachelor thesis deals with the basic physical principles of dielectrics as well as the description of the phenomenon of dielectric absorption. The work presents diagnostic methods that use this phenomenon, based on the events taking place in the dielectric after the connection of DC voltage. Furthermore, the work deals with diagnostic methods for determining the state of insulation of various high-voltage electrical equipment. The work also deals with the properties and parameters of electrical insulating materials - specifically polymers. We obtain these parameters using the mentioned diagnostic methods. By knowing these parameters, we achieve enough information about the insulation to determine its condition and prevent possible damage.
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